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Wonderful Diamond.-S.ngular Curiosity

OCULUS MUNDI. Mr. Bruckman left a piece of this stone, weighing 35 grains, seven hours in water, the space requisite to make it perfectly transparent; and in that time he found that it had gained three grains in weight. The hydrophanes becomes much sooner transparent when put into hot water; and the same happens if it be dipped in a very dilute acid, or rather a very dilute solution of alkali. When dipped in oil of vitriol, it becomes very quickly transparent, and will continue so on account of the strong attraction of that acid for moisture, which takes as much from the atmosphere as is necessary to keep the stone transparent; but its opacity will return, if it be dipped in an alkaline liquor, and then dried. An account of a WONDERFUL DIAMOND, IN THE ISLAND OF BORNOU.- The rajah of Mathan possesses the finest and largest diamond in the world, that has hitherto been discovered. This diamond, which is said to be of the finest water, weighs 367 carats. The celebrated Pitt diamond weighs only 127 carats. The Mathan diamond is shaped like an egg, with an indented hollow near the smaller end. It was discovered at Landak, about ninety years ago; and though the possession of it has occasioned numerous wars, it has been about eighty years in the possession of the Mathan family. Many years ago, the governor of Batavia sent a Mr. Stuvart to ascertain the weight, quality, and value of this diamond, and to endea vour to purchase it; and in his mission, he was accompanied by the sultan of Pontiana. After examining it, Mr. Stuvart offered 150,000 dollars for the diamond, the sum to which he was limited; and, in addition to this sum, two war-brigs, with their guns and ammunition, together with a certain number of great guns, and a quantity of powder and shot. The rajah, however, refused to deprive his family of so valuable an hereditary possession, to which the Malays attach the miraculous power of curing all kinds of diseases, by means of the water in which it is dipped, and with which they imagine the fortune of the family is connected.

We shall close our department of remarkable Stones, with the following account of A SINGULAR CURIOSITY.-Mr.

Sloughton, the Spanish Consul at Boston, in North America, has in his possession a flint pebble, obtained amongst ballast stone, thrown from a vessel at an eastern port. When broken, it presented two half heads in profile; all the outlines of feature and hair were perfectly distinct, and the heads were of a darker colour than the rest of the stone. What is most surprising is, that the one face was male and the other female; and even the putting up of the hair was appropriate to the sexes: they were situated, in the stone, face to face.